Standards Guide

What Does “100% Grass-Fed” Actually Mean?

“Grass-fed” and “100% grass-fed” are not the same thing, and neither is legally protected in the US. Here's how to tell the difference and which certifications you can actually trust.

The Core Problem: No Federal Definition

The USDA withdrew its grass-fed marketing standard in 2016 after industry lobbying. Since then, any beef producer can call their product “grass-fed”regardless of how the cattle were actually raised. A steer grain-finished in a feedlot for its last 90 days can legally be labeled “grass-fed.”

The USDA has no enforceable definition of “grass-fed.” The term alone on a label, without third-party certification, is a voluntary marketing claim.

This is why the word “100%” matters, and why third-party certification matters even more. Without one, both claims are unverified.

Grass-Fed vs. Grass-Finished: The Critical Difference

The finishing period, the last 90–150 days before slaughter, is when most conventional cattle are moved to feedlots and fed grain. This period has an outsized effect on the nutritional profile of the beef:

Grain-Finished (“Grass-Fed”)

· Cattle eat grass for 12–18 months
· Moved to feedlot for final 90–150 days
· Grain feeding rapidly changes omega-3:omega-6 ratio
· CLA content drops significantly
· Nutritional profile approaches conventional beef

100% Grass-Fed & Finished

· No grain at any stage of life
· Cattle grow more slowly (24–30 months)
· 2–5x more omega-3 fatty acids than grain-fed
· 2–3x more CLA (conjugated linoleic acid)
· Higher vitamin E, beta-carotene, and B vitamins

The nutritional benefits of grass-fed beef are almost entirely derived from the finishing period. If an animal was grain-finished, much of the omega-3 and CLA advantage disappears, regardless of what it ate for the first 18 months.

Label Comparison: From Weakest to Strongest

Label	Diet Claim	Verified?	Nutrition
"Grass-Fed" (uncertified)	May include grain finishing	No	Unknown
"Grass-Fed" (USDA Process Verified)	Grass-fed, but standard varies	Yes	Likely improved
"100% Grass-Fed" (no certification)	Voluntary claim, may be accurate	No	Likely good
AGA Certified Grass-Fed	No grain ever, US farms only	Yes	Verified superior
Certified Regenerative by AGW	100% grass-fed + land practices verified	Yes	Highest standard

Certifications That Verify 100% Grass-Fed

American Grassfed Association (AGA)

Gold Standard

The most rigorous domestic grass-fed certification. AGA requires cattle to be born and raised in the US, fed only grass and forage from weaning to harvest, never confined to feedlots, and never administered antibiotics or growth hormones. Third-party audits verify compliance. If you see the AGA logo, the 100% grass-fed claim is verified.

Found on: US Wellness Meats, Verde Farms, Thousand Hills, Force of Nature, Panorama Organic

Certified Regenerative by A Greener World (AGW)

Highest Standard

Includes all AGA requirements plus verified land management practices: soil health, carbon sequestration, biodiversity, and holistic grazing. If a product carries this certification, it is 100% grass-fed and grass-finished as well as raised regeneratively.

Found on: White Oak Pastures, Force of Nature

USDA Process Verified (PVP), Grass-Fed Claim

Moderate

USDA PVP verifies that a company's own documentation is internally consistent, but it does not define what 'grass-fed' means independently. It's a step above nothing, but not as rigorous as AGA. The specific claim being verified matters: look for '100% Grass-Fed' or 'Never Fed Grain' specifically.

Found on: White Oak Pastures, US Wellness Meats